Telephone and fibre optic cables.

Telephone and fibre optic cables.

T350/0488 Rights Managed

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Caption: Fibre optics. Telephone handset and a cable containing optical fibres. A telephone works by converting sound waves into electrical signals. These signals are then converted back into sound by the receiving telephone. The increasing number of telephone calls has required the use of high- volume transmission equipment such as optical fibres. The telephone's electrical pulses are converted into light at an exchange and sent down optical fibres. The optical fibres have a core of flexible glass covered in a protective coating. The difference in the refractive indexes of the core and coating means that the cable internally reflects light with little absorption.

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Keywords: cable, communication, communications, fibre optic, fibre optic cable, fibre optics, light guide, optical fibre, optical fibres, technology, telephone

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